To obtain a composition excellent in transparency and rigidity while retaining high impact resistance even at low temperature, for example, at 0°C or lower, by adding a nucleating agent to a propylene resin which satisfies specified conditions based on measurements by the temperature-rise fractionation method.

The propylene resin used is a propylene/ethylene block copolymer comprising mainly a propylene homopolymer and a propylene/ethylene copolymer and has specified physical property values. The amount of its component eluted at 30°C or lower, measured by the temperature-rise fractionation method, is 10-30 wt.% of the total elution amount and the ethylene content of the component is 10-25 wt.%. The amount of its component eluted in a temperature range from 40 to 85°C, measured by the temperature-rise fractionation method, is 13-75 wt.% of the total elution amount. The intrinsic viscosity [η]1 of the component eluted at 103°C or higher and the intrinsic viscosity [η]2 of the component eluted at 30°C or lower, obtained by the temperature-rise fractionation method, satisfy the relation of the formula: 4/3.[η]1>[η]2.